z^o C O N G H O L O G Y. 



and filled with a firong cartilage, as in 



PL VI. fig, 2. a. 



The fpecies of this family are very nu- 

 merous 'y fome are curious though not 

 beautiful, and bear a large price, as the 

 Hammer Oyjler^ the Cockfcombs^ &c. 



This family is ranked as a diftin£l one 

 by all authors, but with many additions 

 or omiflions : as for example, Linnaeus 

 lanks the Efcallops with them, and Ar* 

 genville, and others the Spondyles, while 

 Lifter ranks the Hammer Oyfter, and fome 

 others, as Efcailops, 



The foffil Oyfters yet undifcovered re- 

 cent or living from fea are very many ; 

 the chief of them are the Gryphytce of 

 fofhlogifts, of which there are leveral fpe 

 cies ; and a very large flat kind with equal 

 valves, found in Shotover and Heddington 

 quarries in Oxfordfliire, V\. VL fig. 2, 



ThQ 



